哈尔滨工业大学材料科学与工程学院,黑龙江 哈尔滨 150001
采用一步水热法合成了不同质量分数的Bi2O2Se/TiO2异质结构,对其进行了X射线衍射、扫描电子显微镜和透射电子显微镜表征,并基于Bi2O2Se/TiO2异质结制备了紫外探测器。实验结果表明:在365 nm紫外光的照射下,Bi2O2Se的质量分数为60%时,Bi2O2Se/TiO2异质结探测器的光电探测性能最好,光电流高于Bi2O2Se探测器,是TiO2探测器的7倍;响应时间约为30 ms,是TiO2探测器的1/6。Bi2O2Se/TiO2异质结探测器的响应度和探测率分别为10-3 A/W、1.08×107 cm·Hz1/2/W,均比TiO2探测器高一个数量级,原因是Bi2O2Se与TiO2复合形成的异质结促进了光生电子和空穴的分离。
探测器 Bi2O2Se/TiO2异质结 水热法 自供能 紫外探测器 光电探测性能 激光与光电子学进展
2022, 59(11): 1104001
哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001
采用熔盐法, 以五水硝酸铋为铋源、硒粉为硒源、水合肼作为还原剂, 在不同NaOH浓度下(0~3mol/L)合成了Bi2O2Se纳米片, 并采用XRD, SEM, TEM以及XPS等对样品的形貌、结构和成分进行了表征。然后, 以Bi2O2Se为工作电极制备了宽光谱自供能探测器, 并探究了它们的光电探测性能。测试结果表明, 在1.1mol/L NaOH的条件下, Bi2O2Se自供能探测器的光电探测性能最优, 在紫外-可见-红外波段具有较高的响应度。在365nm紫外光照射下, 光电流最高可以达到7.8μA, 其上升和下降时间分别为30和21ms。同时, 通过计算得到其响应度和探测率分别为4.2×10-4A/W和1.02×109Jones。
熔盐法 宽光谱 自供能探测器 Bi2O2Se Bi2O2Se molten salt method wide spectrum self-powered detector
Author Affiliations
Abstract
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
We design and demonstrate a type of multiplexed hologram by nanoscatterers inside a dielectric-loaded plasmonic waveguide with guided-wave illuminations. The mode division multiplexed hologram (MDMH) is fulfilled by the scattering of guided waves to free space with respect to different modes. According to different mode numbers, these guided modes have different responses to the multiplexed hologram, and then give rise to different holographic images in reconstructions. In experiments, we show two kinds of MDMHs based on TM0/TE0 and TE0/TE1 modes as examples. Our approach could enrich the holography method that favors on-chip integration.
090.4220 Multiplex holography 050.1970 Diffractive optics Chinese Optics Letters
2018, 16(7): 070901